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Code

Basic preprocessing of IPv6 packets; pseudoheader

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This commit is contained in:
Michal Zima 2012-03-31 11:27:18 +02:00
parent 94cbbb5c53
commit d44253f5ed
2 changed files with 44 additions and 13 deletions
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29
src/ipv6.c
View File

@ -1,6 +1,6 @@
/* /*
* WrapSix * WrapSix
* Copyright (C) 2008-2010 Michal Zima <xhire@mujmalysvet.cz> * Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
* *
* This program is free software: you can redistribute it and/or modify * This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as * it under the terms of the GNU Affero General Public License as
@ -16,11 +16,12 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>. * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/ */
#include <netinet/in.h> /* IPPROTO_* */
#include <stdio.h> #include <stdio.h>
#include <string.h> /* memcpy */ #include <string.h> /* memcmp */
#include "wrapper.h"
#include "ipv6.h" #include "ipv6.h"
#include "wrapper.h"
int ipv6(struct s_ethernet *eth, char *packet) int ipv6(struct s_ethernet *eth, char *packet)
{ {
@ -28,14 +29,34 @@ int ipv6(struct s_ethernet *eth, char *packet)
char *payload; char *payload;
/* load data into structures */ /* load data into structures */
ip = (struct s_ipv6*) packet; ip = (struct s_ipv6 *) packet;
payload = packet + sizeof(struct s_ipv6); payload = packet + sizeof(struct s_ipv6);
/* test if this packet belongs to us */
if (memcmp(&wrapsix_ipv6_prefix, &ip->ip_dest, 12) != 0 && if (memcmp(&wrapsix_ipv6_prefix, &ip->ip_dest, 12) != 0 &&
memcmp(&ndp_multicast_addr, &ip->ip_dest, 13) != 0) { memcmp(&ndp_multicast_addr, &ip->ip_dest, 13) != 0) {
printf("[Debug] This is unfamiliar packet\n"); printf("[Debug] This is unfamiliar packet\n");
return 1; return 1;
} }
switch (ip->next_header) {
case IPPROTO_TCP:
printf("[Debug] IPv6 Protocol: TCP\n");
/*ipv6_tcp(eth, ip, payload);*/
break;
case IPPROTO_UDP:
printf("[Debug] IPv6 Protocol: UDP\n");
/*ipv6_udp(eth, ip, payload);*/
break;
case IPPROTO_ICMPV6:
printf("[Debug] IPv6 Protocol: ICMP\n");
/*ipv6_icmp(eth, ip, payload);*/
break;
default:
printf("[Debug] IPv6 Protocol: unknown [%d/0x%x]\n",
ip->next_header, ip->next_header);
return 1;
}
return 0; return 0;
} }

16
src/ipv6.h
View File

@ -1,6 +1,6 @@
/* /*
* WrapSix * WrapSix
* Copyright (C) 2008-2011 Michal Zima <xhire@mujmalysvet.cz> * Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
* *
* This program is free software: you can redistribute it and/or modify * This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as * it under the terms of the GNU Affero General Public License as
@ -28,9 +28,9 @@ struct s_ipv6_addr {
/* IPv6 header structure */ /* IPv6 header structure */
struct s_ipv6 { struct s_ipv6 {
unsigned char ver; /* 8 b; version */ unsigned char ver; /* 4 b; version */
unsigned char traffic_class; /* 8 b; traffic class */ unsigned char traffic_class; /* 8 b; traffic class */
unsigned short flow_label; /* 16 b; flow label (qos) */ unsigned short flow_label; /* 20 b; flow label (qos) */
unsigned short len; /* 16 b; payload length */ unsigned short len; /* 16 b; payload length */
unsigned char next_header; /* 8 b; next header */ unsigned char next_header; /* 8 b; next header */
unsigned char hop_limit; /* 8 b; hop limit (replaces ttl) */ unsigned char hop_limit; /* 8 b; hop limit (replaces ttl) */
@ -38,6 +38,16 @@ struct s_ipv6 {
struct s_ipv6_addr ip_dest; /* 128 b; destination address */ struct s_ipv6_addr ip_dest; /* 128 b; destination address */
} __attribute__ ((__packed__)); } __attribute__ ((__packed__));
/* IPv6 pseudoheader structure for checksum */
struct s_ipv6_pseudo {
struct s_ipv6_addr ip_src; /* 128 b; source address */
struct s_ipv6_addr ip_dest; /* 128 b; destination address */
unsigned int len; /* 32 b; payload length */
unsigned int zeros:24; /* 24 b; reserved */
unsigned char next_header; /* 8 b; next header */
} __attribute__ ((__packed__));
int ipv6(struct s_ethernet *eth, char *packet); int ipv6(struct s_ethernet *eth, char *packet);
#endif /* IPV6_H */ #endif /* IPV6_H */